title: Papillary carcinoma arising from thyroglossal duct cyst with thyroid and lateral neck metastasis.
abstract: BACKGROUND
  Thyroglossal duct carcinomas (TGDC) are rare, with approximately 274 reported cases since the first report in 1915. The prevalence of carcinomas in surgically removed thyroglossal duct cyst (TGD) is less than 1%. The usual recommended treatment for this condition is the Sistrunk operation, but controversies remain regarding the need for total or partial thyroidectomy.
  
  
  METHODS
  A 28-year-old woman was admitted to our hospital with the symptoms of painless midline neck swelling and growing mass. A preoperative computed tomography (CT) showed a 4cm sized heterogeneous mass at the infrahyoid anterior neck. Ultrasonography of the neck additionally showed suspicious metastatic lymph node at right level VI, both level VI. The patient underwent a Sistrunk operation. The frozen section revealed papillary carcinoma arising from TGDC and also revealed metastatic papillary carcinoma in the right thyroid, at right level III and level VI. Total thyroidectomy, right modified radical neck dissection and central neck dissection were performed. The thyroid gland and TGD were confirmed papillary carcinoma. The dissected neck lymph nodes revealed metastatic papillary carcinoma.
  
  
  CONCLUSIONS
  The usual recommended treatment for TGD is the Sistrunk procedure. There is controversy regarding whether total or partial thyroidectomy should be performed.
  
  
  CONCLUSIONS
  Physicians should be aware of extended operation, including thyroidectomy and/or neck node dissection for TGDC with metastatic lesion of thyroid and neck node.
authors.affiliation: Department of Surgery, Kosin University College of Medicine, Busan, Republic of Korea. Electronic address: tonybin@daum.net.
authors.forename: Song-I
authors.initials: SI
authors.lastname: Yang
authors.forename: Kwang-Kuk
authors.initials: KK
authors.lastname: Park
authors.forename: Jeung-Hoon
authors.initials: JH
authors.lastname: Kim
keywords: Lateral neck dissection; Papillary carcinoma; Sistrunk procedure; Thyroglossal duct carcinoma